<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="/node_modules/bootstrap/dist/css/bootstrap.min.css" />
    <title>Document</title>
</head>

<body>
    <div class="container">
        <div class="row">
            <div class="col-md-12 col-lg-12">
                <div class="col-md-6 col-md-offset-3 col-lg-6 col-lg-offset-3">
                    <div class="panel panel-info" style="margin-top:50px;">
                        <div class="panel-heading">
                            <h3>售后评价</h3>
                        </div>
                        <div class="panel-body">
                            <form onsubmit="return false">
                                <div class="form-group">
                                    <label for="comments">商品评论</label>
                                    <input class="form-control" type="text" id="comments" />
                                </div>
                                <div class="form-group">
                                    <input class="btn btn-danger" type="button" id="attck" value="会被攻击" />
                                    <input class="btn btn-primary" type="button" id="security" value="我很安全" />
                                </div>
                            </form>
                            <ul class="list-group">

                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>
<script src="/node_modules/jquery/dist/jquery.js"></script>
<script>
    // 反射型 XSS 攻击
    $(document).ready(function () {
        $('#attck').click(function () {
            let commend = $('#comments').val();
            //没有对输入内容进行过滤
            if ($.trim(commend)) {
                $('.list-group').append(`<li class="list-group-item">${commend}</li>`);
                $('#comments').val('');
            }
        });
        //Html 编码
        function encodeHtml(str) {
            return str.replace(/"/g, '&quot;')
                    .replace(/'/g, '&apos;')
                    .replace(/</g, '&lt;')
                    .replace(/>/g, '&gt;')
        }
        $('#security').click(function () {
            let commend = $('#comments').val();
            //对输入内容进行转义
            //如果是url地址，可以直接使用 encodeURIComponent 进行转义
            if ($.trim(commend)) {
                $('.list-group').append(`<li class="list-group-item">${encodeHtml(commend)}</li>`);
                $('#comments').val('');
            }
        });
    });

</script>
</html>